cognizance vs familiarity

cognizance

noun
  • Notice or awareness. 

  • An emblem, badge or device, used as a distinguishing mark by the body of retainers of a royal or noble house. 

  • Jurisdiction. 

familiarity

noun
  • An instance of familiar behaviour. 

  • Undue intimacy; inappropriate informality, impertinence. 

  • Close or habitual acquaintance with someone or something; understanding or recognition acquired from experience. 

  • The state of being extremely friendly; intimacy. 

How often have the words cognizance and familiarity occurred in a corpus of books? (source: Google Ngram Viewer )